單項選擇題What does the abbreviation VHF stand for?()

A.Vessel's Hoisting Flag
B.Very High Safety
C.Vessel's Homing Frequency
D.Very High Frequency


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2.單項選擇題There is a VHF set()the front of the wheelhouse.

A.at
B.on
C.of
D.in

4.單項選擇題There is a()mine in position 50°N,30°W.

A.drifting
B.drifted
C.drift
D.draft

5.單項選擇題The weather is often()in a high-pressure area.

A.fine
B.cloudy
C.rainy
D.windy